Typewriting machine



April 5 1927.

A. G. F. KuRowsKl TYPEWRITING MACHINE '2 Sheets-Sheet l Filed ,March 51, 1924 HIS ATTU w27. 1,623,481 AFM 5 A. G. F. KuBowsKl :"wfszwruT1miivmcunm Filed March l31. 1924 2 Sheets-Shee'cB /N VEN TOR Patented Apr. 5, 1927. y Y

f Unire STATES ,1, TNT FICE.

v ALFRED Gr.12 KURowsKI, F BROOKLYN,V NEW YORK, AssI'GNoR To UNnERwoon TYPE'- WRITER COMPANY, 0F NEW YORK, N. Y., A coREoR-ATION or DELAWARE, g1

V TYPEWRITING MACHINE.'-

Appiieation mear/:arch 31.1924.A serial No.A 703,087.

- This invention relates-to improvements in portabletypewriting machines, and particularly to the carriage-operating mechanism.

.A feature of the'invention is the provision of back-spacing mechanism including a pawl effectiveto engage and move the escapement-wlieel suciently to permit the stepping dog of the carriage-feeding mechanismto trip over one tooth ofthe escapement-wheel and assume a 4position for enthewkey' and said back-spacing p'awl, forminga further feature-.of the invention.

Otherfeatures and advantages will here-- 3o inafter appear.

In the accompanying drawings,

Figure lis an approximatecentral vertical section of, the limproved machine;

Figure 2 is an end elevation, looking from the left, with parts of the frame broken f '.away. Figui'e is a front elevation of the escapenientdevice and connections.

Figure .4: is a. plan view of Figure 3. Figure 5 is a detail of the carriage-motor. Figures 6 and 7 are Vdiagrammatic views, showing the back-spacing mechanism and co-operating parts in .their several positions. In the present embodiment of the inven Y tion', the frame of-theimproved machine, indicated generally at l, has the usual keyleveis 2 which operate type-bars 3 through connections comprising bell-cranks 4, and links 5, the bell-cranks pivoted on a common 5o support 6 by means of a fulciui'nrod 7.

The type-bars arepivotally mounted on Va fulcruin rod 8 carried by a. segment 9 which,

v as shown,'is inclined rearwardly towards its top. A type-bar rest 10 is provided for engag'ement by the type-bars in rest position,

different'case-type positions,fthere are pro-v vided a novel keyk and la linkage betweenV andv the `usual ,vplaten11, mounted .car-""- riage 12, segment.

The carriage isy tudinally in a carriage shift-frame 13, and

is arranged above and behindkthe mounted to move longi-f 5 6o bearings 14 are arranged between the frame f; and the. carriage, in Vraces formedby bearsf ing rails 15 on the carriageand co-operating rails '16 on the shift-frame. 4The shiftframe isvsupported by links 17 land- 1 8 at ing plane ofthe typefacesto upper and' lower case positions, and mechanism is pro-.` vided for feeding .thecarriage with astepbystep movement, said mechanism being controlled by a universal bar 19.

.This baris mounted in agroo've`20 infv the rear face of the segment, and vit is engaged Aby extensions 21 on the type-bars Awhen the kbars attain a vertical position.'M

Further movement of the barstoward printing position moves the universal bar rearwardly, and, setsy theI feed y mechanismpsio that when the universal bar returns to its t normal position t-lie carriage feeds.

The

carriage-feeding mechanism' coni- 5 prises an escapement wheel 22 Journaled on the rear plate 23of the shift-frame, and

having rigid therewith a coaxial pinion 24" which is engaged by a rack-bar 25` supported vby levers 2o below the carriage-frame.

By nieansof a finger-piece 27.]'ou'rnaled on thel axle ofthe platen, the levers 26 ,inay be operated tourelease the rack-bar from thei pinion when desired. lj A 'Y i yThe escapement wheel isy controlledto feed by the usual spring motor 28, supported by" a bracket 29 on the rear plate 23 ofthe shift-` frame, and connected to the carriage by the usual strap, not shown. A stepping'dogl() normally checks the forward or feed movement of the escapement wheel, said'dogibeing pivoted toa rocker 31,'pivotally inounted on the rear plate 2 3. The rocker has a holding dog 32which, when'the rocker is swung to movey the stepping dog` rearwardly out of the plane of the escapemeiit ,whe el, is moved into engagement` therewith.` A

spring 33 connected withthe stepping 'dog 'I 105 swings the dog away from `a 'stop 34 which' limits the movement of the stepping dogv with the escapenient wheel in its forwardV movement,V and into vposition beyond ythat toothV of the wheel that is'then' inengageineii'twithv the holding dog,so that whenthe iio.'

nism for the carriage including an escapement-wheel and a stepping dog, a stop for limiting the letter-feeding movement of the Stepping d0g, a key, a pawl operable by depressionrof said key to engage and move the escapement-wheel, to back-space the' carriage, an abutment engageable by said pawl vfor positivelyl limiting the back-spacing movement of said pawl after the stepping dog has tripped over one tooth and assumed a position for engagement with the next successive tooth of the escapement-wheel,

means for guiding said pawl against said abutment and also for forcing said pawl into frictional engagement with the escapement-wheel after the stepping Vdog has Y*tripped to the aforesaid position, and means mounted adjacent said escapement-wheeh'a key-lever,operating connections between the key-lever and the arm, a pawl pivoted adjacent the free end of said arm, said pawl including a tooth-engaging lip and a projection vextending therebeyond in the direction of the pawl travel, stop-means for maintaining said pawl in a position substantially tangential to the escapement-wheel, said keylever being effective to cause said lip to engage the teeth of the escapement-wheel and to rotate the same in back-spacing direction, whereby to cause the stepping dog to trip over one tooth of the escapement-wheel and assume a position forV engagement with a new tooth thereof, and an abutment engageable by said projection for positively stopping the travel of said pawl after the stepping dog has reached the aforesaid position.

3. In a typewriting machine, the combination of a carriage, letter-feeding mechanism for the carriage including an escapement-wheel and a stepping dog, an arm pivoted adjacent the escapement-wheel, a keylever, operating connections between the keylever and the arm, a stop limiting the rearward position of the arm, resilient means holding said arm againstthe stop, apawl pivoted adjacent the free end ofV said arm, stop-means including a spring maintaining said pawl on said arm in a position substantially tangential to the escapen'ient-Wheel, said key-lever operable to move said arm to cause the pawl to engage a tooth of the wheel and to rotate said wheel in back-spacing direction, the stepping dog being effective during such back-spacing operation to trip over one tooth of said escapement-wheel and lassume a position for engagement with the next succeeding tooth, and a stop including back-spacing travel of the pawl, said plate effective to force said pawl into braking ena Y gagement with the' escapement-wheel and to lock the pa-wl against the stop until the key-lever is released, the carriage-feeding mechanism being effective to return the escapement-wheel to stop position witlithe stepping dog in engagement with the successive tooth of the escapement-wheel.

4:. In a typewriting'machine, a carriageA and a carriage-shift-frame having a rear plate, carriage-feedv mechanism including an escapement-wheel journaled on `the plate, and mechanism independent of the wheel and supportedby the platel for (3o-operating with the wheel to back-space the carriage, said mechanism including a pawl, a stop for limiting the stroke of the pawl, and means to force the pawl into braking engagement with the wheel as it engages the stop, saidstop and means supported by the plate.

5. In a typewritlng machine, carriagefeed mechanism including an escapementwheel, a back-spacing pawl positioned apart .from the wheel on a line tangential thereto .and mounted to move along said line into engagement with the teeth ofthe wheel, and

to be swung away from the wheel by the teeth thereof on the return stroke, a stop to limit the stroke of the pawl, and a camsurface to force the pawl toward the wheel as it engages the stop thereby to brake'the wheel. Y 6.7In a typewriting machine, the 'combination of a platen, a carriage, a case-shift frame shiftable in a rearwardly-inclined plane, an escapement-mechanism including an escapenient-\vheel, a pawll operable to engage the teeth of said escapement-wheel to back-space the carriage, a key, and operating connections between said key and the pawl, said connections including a link 1 tion to the link to actuate said pawl, in all ,i case-type positions of the case-shift frame.V

7. In atypewriting machine,the combination of a platen, a carrlage, a case-shift frame shiftable 1n a rearwardly-Incllned plane, Van escapement-mechanism includingV an escapement-wheel, a pawl operable to engage the teeth of said escapement-wheel to back-space the carriage, a swingable arm upon which said pawl is mounted, a support on said case-shift frame, a lever having one end thereof pivoted to said support, a connection between the swingable arm and the free'end of said levier, aV back-spacing VS1 thete'offsaidYlinkextendingforwardly :f'xornAV all Case-type positions of' the- CaSe-Shift. 10 Y 254 sairdzlever-nnclitermihating in a portion di? Vframe.. A y i `i vrieiedfupwardly, thQ-.re'eend 'of ,said-afm; Y v .ALFRED GHF.V KUROWSK-L l 

